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Function BPK2

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Riki Afriansyah

This document discusses functions in C programming. It defines what a function is and explains that functions make programs easier to understand and maintain by breaking them into subprograms that perform specific tasks. It provides examples of function syntax, declaring and defining functions, and calling functions. It also discusses the differences between local and global variables and provides exercises for the reader to practice writing functions.

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Bahasa Pemograman Komputer (BPK) 2 Riki Afriansyah
Contents Contents What is a function? Syntax of Function Void Functions Local VS Global Variable
What is a function? A large program in c can be divided to many subprogram. The subprogram is called as a function A function is a block of code that performs a specific task Creating an application using function makes it easier to understand, edit, check errors etc. A function is a set of statements that take inputs, do some specific computation and produces output
Syntax of Function
#include <iostream> using namespace std; int sum (int x, int y); //declaring function int main() { int a = 10; int b = 20; int c = sum (a, b); //calling function cout << c; } int sum (int x, int y) //defining function { return (x + y); } Declaring, Defining and Calling Function
Void Functions A void function returns values by modifying one or more parameters rather than using a return statement. For example:
Void Functions Example 2.
Local Variable VS Global Variable A local variable is a variable that is declared inside a function. A global variable is a variable that is declared outside all functions. A local variable can only be used in the function where it is declared. A global variable can be used in all functions.
Local Variable VS Global Variable
EXERCISES 1 Write a program that calculates (Add, Subtract, Multiply, Divide and Modulus) using functions.
EXERCISES 2 Write a program that If f(x) = x2+ 3x + 1, then find the values of f(0), f(1), f(2), f(3).
EXERCISES 3 Write a program that ask for three numbers, compare them and show the maximum. Declare a function called max_three that compares the numbers and returns the maximum. See the sample below.
EXERCISES 4 Write a function that uses n (integer) and prints out a triangle as the following example (for n = 5) :
EXERCISES 5 Write a program that calculate surface area and volume of cubes. You must be using: Local variabel for the side of a cube (int S) and Void with two functions (surface area and volume).
Function BPK2

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Function BPK2

  • 2. Contents Contents What is a function? Syntax of Function Void Functions Local VS Global Variable
  • 3. What is a function? A large program in c can be divided to many subprogram. The subprogram is called as a function A function is a block of code that performs a specific task Creating an application using function makes it easier to understand, edit, check errors etc. A function is a set of statements that take inputs, do some specific computation and produces output
  • 5. #include <iostream> using namespace std; int sum (int x, int y); //declaring function int main() { int a = 10; int b = 20; int c = sum (a, b); //calling function cout << c; } int sum (int x, int y) //defining function { return (x + y); } Declaring, Defining and Calling Function
  • 6. Void Functions A void function returns values by modifying one or more parameters rather than using a return statement. For example:
  • 8. Local Variable VS Global Variable A local variable is a variable that is declared inside a function. A global variable is a variable that is declared outside all functions. A local variable can only be used in the function where it is declared. A global variable can be used in all functions.
  • 9. Local Variable VS Global Variable
  • 10. EXERCISES 1 Write a program that calculates (Add, Subtract, Multiply, Divide and Modulus) using functions.
  • 11. EXERCISES 2 Write a program that If f(x) = x2+ 3x + 1, then find the values of f(0), f(1), f(2), f(3).
  • 12. EXERCISES 3 Write a program that ask for three numbers, compare them and show the maximum. Declare a function called max_three that compares the numbers and returns the maximum. See the sample below.
  • 13. EXERCISES 4 Write a function that uses n (integer) and prints out a triangle as the following example (for n = 5) :
  • 14. EXERCISES 5 Write a program that calculate surface area and volume of cubes. You must be using: Local variabel for the side of a cube (int S) and Void with two functions (surface area and volume).
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